UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 2850: Propylene tetramer

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2850 is assigned the proper shipping name Propylene tetramer in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 3 Flammable Liquid material, Packing Group III. Required label(s): 3.

Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.

Emergency Response (ERG Guide 128)

Hazards: HIGHLY FLAMMABLE. Vapors may form explosive mixtures with air. Vapors heavier than air. Runoff may pollute waterways.

Fire: Small: dry chemical, CO2, water spray, regular foam. Large: water spray, fog, regular foam. Do not use straight streams.

Spill: Eliminate ignition sources. Stop leak if safe. Use foam to suppress vapors. Absorb with earth, sand, or other absorbent. Prevent runoff to waterways.

Chemical and Physical Properties

Propylene tetramer appears as a colorless liquid. Less dense than water and insoluble in water. Vapors are heavier than air. May irritate skin and eyes, and may be narcotic in high concentrations. Used to make other chemicals.

CAS Number: 6842-15-5
Molecular Formula: C12H18
Molecular Weight: 162.27 g/mol
Boiling Point: 365 to 385 F
Flash Point: 120 F
Autoignition: 400 °F (USCG, 1999)
Specific Gravity: 0.2937 (floats on water)

Special Provisions

49 CFR 172.102 special provision codes for this entry: B1, IB3, T2, TP2. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.

Need the full interactive record? Open UN 2850 in the SpillNerd lookup tool for the live database entry with placard graphics, GHS pictograms, full segregation tables, and synonym search. For another material, use the UN number and chemical lookup.

Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.